Density

How much crowded a city is? How much mass a lift accumulates? What's the mass of 1 cubic centimeter of gold? These all decides the Density!

Density is that what decides how much mass a given volume accumulates!

Its often confused by many that mass and density are the same. If it is so how come density of a cubic centimeter of gold varies from aluminium? Mass is the matter in a given object. Density is the amount of mass in a certain volume. Thus volume is that what makes the mass different from density.

Density Measurements

The density can be measured using the weighing instrument called Hydrometer. It is measured using the displacement of the fluid. Hydrometer is an instrument to determine the density of the liquid. It consists of glass float with a long thin stem which is graduated.

It works on the principle of floatation. It sinks in lighter liquid as compared to denser liquid and hence displaces more liquid. The density based on how markings sinks on the hydrometer. the lowest density marking is on the top of the stem of hydrometer and maximum density marking will be at the bottom of the graduated stem.

Relative Density

Relative density is that what tells about comparison of the density of any object with that of standard substance. It is the ratio of the density of a substance to the density of the reference material. It is given by

Air Density

Air density is is nothing but the mass of the air for the given volume and tells about how much air is accumulated in a given volume.It gives relation between the temperature, pressure and density as a function of altitude. It decreases with increasing altitude and is given as

Density of Ice

Water is frozen state is what we call as ice. The compactness of molecular arrangement of ice to that of water is different. Here as temperature increases density increases as each molecule in water is hydrogen bonded $\frac{3}{4}$ other molecules while in ice each hydrogen is bonded to 4 other molecules.This makes the ice to float on water and has less density.